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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344171a7e0e4649f6cd7c3223096169854a9cdb5fd878ebd5a63ed84a439060a' 
  AND token = 'bQOsM1QhX5lpiYmvoUjxGbPIteriVl20uUD+1QaOH44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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