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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7576e24f7f93b04cff932cf9eb1a1d5e06b7d65e97f505a7d24fbfb07b27fb88' 
  AND token = 'MX3LPTyqwvyHy1WV2ME/kHEV+Nx2MraEZ7NUTy3Yo+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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