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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba697e82ffee7af59496d3fbe20545212068ab96e54bc1069662e44de2d21bb' 
  AND token = 'Uu+St6GmBJrSleoFaL5yB7/coRWI//uAuxWW5OwAH2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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