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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7141b3b88aabfbe3866091ab129b32340c804852aaa45298d1dc9c08a0e4f99' 
  AND token = 'bDra3tU2soLWIhFWZkXSs1q0BqfPsBngqS71pRaaZfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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