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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901a134433c83067fab4b40740497365ca80897ca4e5804a4809d64c9a0fbc98' 
  AND token = 'AxsARDbDyJ0pG16AY+s5XOPJ89bjd4XC27SNZ6sO0pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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