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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44c8f5d6423f2df08d5702ee7b5065fc1db6cdd7f98d005a11c36cab5c7d201' 
  AND token = 'AgKC1SHceV4bEljRxTCL/nTZ2A+BFEDdGsmky/dRixc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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