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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcc39bbce41d5c14c2b00b21b8f6b506325fdf58a382af79ffef7712aae080b' 
  AND token = '3NsQzmABxQylxEccMXKXfkSCLwLEwvTyG/OxlEC2Pyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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