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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7ed9171afde4954234c7263c2d287edcee42b4956907489bd4c65e75cde7c7' 
  AND token = '6D5wHIbVTdrG57lMpF8E2AQWyQ2bugP8urxNL1py7fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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