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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d29087e357ec7b7fadeb300a1e086081debd035814f1d2c18bd8a3e7f0602ee' 
  AND token = 'frlv+z62EQEP8533/QYZ2VTFni5IZTfn3SAzKKA4sDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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