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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f50244c523de1abe0d923816c06a16bf0a060918cd47b4ec95a1b7260cd02e' 
  AND token = 'kS3N59hcZU1uzN8C3Q2IKQ2mAvAub9rlXtgsW/1FOJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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