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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3a3ab0d5885de22100e549c3f631068b6205a20628ddd1e324d6b941a90d61' 
  AND token = 'Ep5qkzG9XXn6p8NVi4a/mii4EHcAcH/U07dOhFg7jI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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