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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8d0c6632d4eda4b5c9886043c9ee1db461bb52b030fbdf7f5a396410edf5fd' 
  AND token = 'OJjw9e4rBqa0A4olVKSBNZ3XL6h6iEotz6+Xoy5+3Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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