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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a0bd981f34ed59d584a05f3bb3f552d76603a774595d0c5b6b78e784c59ca2' 
  AND token = '8Vuqamte0czNES0EHF+mWyOAZreay3H6mZQ+Q3xK3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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