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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807f929d68c1237f7ef1c45696510f8192f3bf545e15221061c4f34aa6c9b5d2' 
  AND token = 'j89BS7MMNaFuw2hTiIErj6iwNC+q7LFfCz+vVPf32oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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