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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bfc16ea7357254d43910341421aedee3ccb85d8a72581af5db4c8b630ef11b' 
  AND token = 'a+HQhiTJuoj9qlnCrHYt/FqheIlIPVJdpOOr1DH2YUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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