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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f47c004734ca324ae4004ab4834193f0a9d92ae716cecd519e833c5d5116545' 
  AND token = 'yx0PzQbIZq/qcDqazDIjPiPfkUD1g0XE4AzsgTKMYAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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