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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202a0752b9703beb4795e158566ce69e51ea7fda8ed41479e61b4d71cf56c4ec' 
  AND token = 'RIEO2xhcQcVXczsb7rdkbKsG9x0ihE5i6X4CNP0oTao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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