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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f444f7d49f8a0c36119cf2c075bb3787238420d9b03fab599fb397c66c91196' 
  AND token = 'tfBoyp+liNLmuEVi/TQ06yio8iDebzZUI+DqMHcmSsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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