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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c534c53d2a993ce59006dfe0520e608102ab84494bf59c406ccf8ba0060bcd90' 
  AND token = 'jj0n8Ji76COQVCeipylcapIhHbynvv8Pb1T1BWaqc9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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