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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626de39cc9432bc9b94e830abb2f1c29c1d97f7b9e6f5e00260d3a8695530cf5' 
  AND token = 'XNBNaiFYKIvu1eDgAdDeCLah4g2bp9yV96HsNdJyCPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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