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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7521736ef3ce6b96df17de609f672373f372220319383df07d5053780a7bea4f' 
  AND token = 'qLyM268N8oKBPBe0eOPIBHlS0ZEV7qitF53B9Ph/i0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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