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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0268a1281cd683aa843606109b33c210d2ffddf30923458b674cfcc03204640e' 
  AND token = '0aZGO06uUfUvBABZQOoe1VDjjQ/idoQYDCHe/XvZSp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}