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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd120a1a0e696fe4f3ace00cd0ec98de972e9ed5ab4e36f07546214c450cbce6' 
  AND token = 'RMsP5ITAl88+c3P5d5D/v6426DECWYFJHyBGRUJ/tOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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