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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdd1943ed756121bff885086a5b73d543aa180f5b32bfde60c15d2e129fcfd6' 
  AND token = 'B9Zin6iopBw2z/cJHIeLXPBV+QzmLJdd0u5ZOLEzE/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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