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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa0db6894b1cf87f47303d02df7add4f25e660b4b77bf0813aafd88a7c963ef' 
  AND token = 'ZR8OhTWWHKYlGCXTrF/y2yUwX4qQwUwiouf7Nz6a2mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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