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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01484a4752cd3e14340601de9242c38e07734d3cdb11bc836d8015ee0deb90e' 
  AND token = 'e1P+9VSA1PfacWdus/BhKkUttwedR2/SQOxwZAxu9aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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