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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b606d6b32db050fa7dfe8a29e8b94a633697e69f7f8b2373b9859116d033e369' 
  AND token = '5CDdr15g6iG7xtY9mxxksst8DlyI8D/UaKvKWOjyeQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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