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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e98081bb9eb9042814a3cff829fbcf5868d3a1af7e5f33a65547786dde5095' 
  AND token = 'Bf1EFtX1jrxNATDkDUWZtfxP0BBYfB2azvahv76QC18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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