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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673b926afd7d1444ad6f9345348d18b6f28a01e5dafc0d75213cf0f8be34521b' 
  AND token = 'i6sT74AiJA3rNQkphAhs3vhcHI5+8OAWhX4gQAtCMGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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