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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88131ca5051146e799045ae64887e851a139a1390c4c43dc4d94fcefd51a0acc' 
  AND token = 'yeOequJVrWBdGLaE6/62+8U2pggZC+XzDRmVZXtxeH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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