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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b9928656bc0918264074b4cdb4355946e0092c2c181be326f20ddda2d582ef' 
  AND token = 'E31moARpDdg3oBKA4Dv9StP7QO4xW3S+tbZLt72xcsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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