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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1913cd9122463bea18a55d7313900899a1200552e63dbb0707cfd09fbc7c6994' 
  AND token = 'FYZfT1khf0RNX14tRFbdOjAU5AbnGdHBh93+TYN7Fhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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