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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f534884f68b77361df71b86558d4844a8a546c26369fda9efd92bdc0b7fd368' 
  AND token = 'JoF8mjmIThZyaut13Smy7AhwHLghrnSGIi4Gp0coKos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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