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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac261f4a4d6c48c2aa5548847b52c134372f3d13e335b952566c180573541abe' 
  AND token = 'zeyulYR3g3OkR2Lp5/A27Mj3kMWjpcJC5Mr8s8dRbTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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