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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00762b593ef38e1b4657a3d46a1b3dac72236b792f07b61a2d07b7b137d57302' 
  AND token = 'atJ1FPjDW0Q9vHhBq6yOtosxJLCns+QDxJAQkppkv24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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