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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af866547e7eed0550940e8a9f85511392be3615d9cacee19830b2a373043b1b' 
  AND token = '33bfwZaRR5vJtHNaM3Yx8Ow5qkkjUoH+3Q2FtLI3cXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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