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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcc3d7a7a52f694c4fa59c47f677fe98861363f994b105b3b5898f44e79cbff' 
  AND token = 'Jl9w9s/pI12UgtxxZRen+nW9xaP9v1MDghyyGxg415Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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