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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10f54785443625f9b7f781b8f5a5f90dc24c27dc9dc6d2343e3b5169fa8cc0b' 
  AND token = 'pvMkKIXamnIuX8Z3ND2bqJlGi9SSNanN0EBiJTm4MI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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