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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b051c41301fbfead99a8742916b2ac6e5ef859365ac14fac44a9f73ed4eac825' 
  AND token = '6kDh49azjdGj7dGNa16I1+9ORlskyXngJcdjciP9ElY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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