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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f125096992920fa350f67d94a7f9a25b7a3b35cc611f715c592724215834b30' 
  AND token = 'gvReZobBzhs1GflYtCZ3yrqR54BkfA7mRbc1uSX4RlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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