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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b25decd85c38cda961961e32a20a83bedec098668bd294f2367f2f5d11fda04' 
  AND token = '1ZJHAUEdGrQFYF9iq4aexm+n2wsAuDr73EwltdmAA5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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