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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a3855929b3369f0b9fffc39094fdbe6c1aa5111a3ed3a82231cf3f0e95f668' 
  AND token = 'IaZVbSpM2gtOM+Wy/mw3FDeIbCO9r8SqgXFVtXp2zJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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