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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0682068935b2cb12593f90b879d1d6d1969cde8c6ec0358ef2d15a0caf7cd3' 
  AND token = 'fuy2H+wwdYam1sJ7hN0zkgwmuVmX2oOqmdg+HISdxaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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