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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56b675c207e615b2c01dd6b33e2ed2173914d93bbed80921208e6bbfdb04a2c' 
  AND token = 'ZToflmKglpNUt1AfwUjw/iwwCT/oHzYw61dKq0coV/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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