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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494198aa5a910ae05f0be74aa361aeae74074cae0723d5e5264e500a493852c9' 
  AND token = 'usA1woVFtBcBgG9vOqug9Fg9fyg+tOMfhlLYxA2uOEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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