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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db4ad877c8bbaf65fcac1c12b3a9fdc6b522f054bbf5b86c659d6d33276b0bc' 
  AND token = '0LDhwQi4aizKE3lL/Nbi1yji3j/aFy4+W6+FHTLITEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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