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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b067781fd9a04a4956486eadb607c853dfdbee564fcd1986c4867d26b2e22a' 
  AND token = 'ehcBOvARzg/kOTCsxA6UfINDI3zel6MGjg4fO0rl8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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