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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b58ea2969f14d39dbfc84a38e74215aac09f80cabad67bbe0ef153ec62591e' 
  AND token = 'BMMbezqY90d8i8QkLmmylii0/KCSPamUvo4/TjIhS7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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