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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d58beed219ddbba9c795e5de18252d178816e1fde7e813c73e0a3f196782bd' 
  AND token = '+66tcCoe3plBlGJoOX4plxKhpcZ0rOuvp31wTuSRZ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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