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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e03caa45ea4c2b1c515fa5e6fe87d3413574f6d3c27baaee542c1b66ac6d84' 
  AND token = 'bQpuVmR7cyfOEYELOpkQnwB1RkB/fsT3owwtk5hZjAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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