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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ee921409c401f7943f40de6107dc08f6fde80f5e7cfff2c3222a5afd606037' 
  AND token = 'JWSx7Ef1t/q7xUTdpJxN/QntkZlQKT3C685RU1kZ/eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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