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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a84925f787ae15aad5111dd8db643d13ebec97e8cd62282bc5d4eecead7535' 
  AND token = '8D3F/hvM1BZhhs+8innbd/yoZ2ATDc56bl/lz9mOBhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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