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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b0a32944600e4b9fef99b5e5ac23c0014b3c6d888aab516e7077f6c9a5c191' 
  AND token = 'NQyOgfYENnVsOvZs8AqAMNaG1xfBMuotzT6cfvPGCZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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