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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f1547dc6b4fa00d2a78c4186ca4db9634a2534500bde24df64edb40b5afb5a' 
  AND token = 'jsa315ikgjX2Hg2Ks7mlhsA1c2U/ekshhINdzrLJrro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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