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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ce2b4f799790685162d686df43caae3ba4ab44252a55061b54da1ff8ae9272' 
  AND token = '+54R1vndgzFI4hH55Wp8WRL1rxY1ci7X8oA1BXR3UTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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