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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd676ddebdfd5844ff7ccee76995bb3915e4fe473879a2c1c2c8887528351c35f' 
  AND token = 'SkX/r/y4BK5RjONNtk4tX4VfF/WAjSNhP5lLyh/BRD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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