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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb7142470971f248932f5fc489d2033027efa765b21bf733cf443072d17b5cb' 
  AND token = 'kf7QyVrn7KkZ2U9/m9ZT8DueN2vC0a094uvYQq/kgyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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