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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f4e42f7aaefa1909a3a5aa2ab1b45388453e9ff51e99d294cd31c8a9688d7a' 
  AND token = 'tmLp7/BJWXno6RUVOqYRK40b8miUzYDq4tuRZVcEAHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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